Ultrasound diagnostic appartus with CMUT bias voltage discharge system

An ultrasound diagnostic system comprising:

• an ultrasound device comprising:
• a capacitive micromachined ultrasonic transducer comprising a first electrode and a second electrode facing each other;
• a connector;
• and
• a discharge device configured to discharge charge accumulated between the first electrode and the second electrode of the capacitive micromachined ultrasonic transducer to a ground;
• and
• an ultrasound observation apparatus comprising:
• a transmission/reception processor configured to output a transmission signal to drive the capacitive micromachined ultrasonic transducer, and to perform signal processing on a received signal received by the capacitive micromachined ultrasonic transducer;
• a connector receiver configured to be detachably connected to the connector of the ultrasound device;
• and
• a DC bias voltage generation circuit configured to generate a DC bias voltage to be superimposed on the transmission signal and the received signal;
• wherein the ultrasound device further comprises:
• a switch configured to selectively switch a common electric contact connected to the first electrode between a first electric contact and a second electric contact, wherein:
• the first electric contact is connected with a signal line that transmits the transmission signal and the received signal, on each of which the DC bias voltage is superimposed, and
• the second electric contact is connected with the discharge device, wherein the charge accumulated between the first electrode and the second electrode of the capacitive micromachined ultrasonic transducer is discharged by the discharge device to the ground via the common electric contact connected to the second electric contact;
• and
• a lock configured to perform:
• a lock operation, when the connector of the ultrasound device is connected to the connector receiver of the ultrasound observation apparatus, to lock the connector and the connector receiver in a locked state in which the connector is prevented from disconnecting from the connector receiver;
• and
• a release operation to release the connector and the connector receiver into a released state from the locked state such that the connector can be disconnected from the connector receiver;
• wherein the switch is configured to switch the common electric contact in conjunction with the lock operation and the release operation of the lock, wherein:
• when the lock performs the lock operation, the switch switches the common electric contact to connect to the first electric contact;
• and
• when the lock performs the release operation, the switch switches the common electric contact to connect to the second electric contact such that the charge accumulated between the first electrode and the second electrode of the capacitive micromachined ultrasonic transducer is discharged by the discharge device to the ground via the common electric contact connected to the second electric contact,
• wherein the ultrasound diagnostic system further comprises a lever configured to actuate the lock to perform the lock operation and the release operation,
• wherein the connector comprises:
• a contact pin constituting the common electric contact,
• a housing that accommodates a proximal end side of the contact pin, and
• a contact pin holding frame provided adjacent to a distal end opening of the housing and configured to hold the contact pin such that the contact pin is movable in a vertical direction which is vertical to a longitudinal direction of the contact pin, and the second electric contact provided on an inner surface near the distal end opening of the housing, the second electric contact contacting the contact pin in the released state, and
• wherein the lock is configured to cause the contact pin to disconnect from the second electric contact in conjunction with a movement of the contact pin holding frame in the vertical direction by the turning operation of the lever in the released state, and further to cause a distal end of the contact pin to mechanically connect to a contact pin receiver constituting the first electric contact provided to the connector receiver when the connector is connected to the connector receiver after the movement of the contact pin in the vertical direction.